MIN_VP8QP         140 gd/libgd/gd_webp.c 	const float scale = MAX_VP8QP - MIN_VP8QP;
MIN_VP8QP         142 gd/libgd/gd_webp.c 	scale * (MAX_QUALITY - quality) / (MAX_QUALITY - MIN_QUALITY) + MIN_VP8QP;